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JPR Advance Access originally published online on October 10, 2005
Journal of Plankton Research 2005 27(11):1175-1187; doi:10.1093/plankt/fbi083
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© The Author 2005. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org.

Embryonic and naupliar development of Eudiaptomus gracilis and Eudiaptomus graciloides at different temperatures: comments on individual variability

Raquel Jiménez-Melero1,2,*, Barbara Santer1 and Francisco Guerrero2

1 Department of Physiological Ecology, Max-Planck-Institut für Limnologie, Postfach 165, 24302 Plön, Germany and 2 Departamento de Biología Animal, Biología Vegetal y Ecología, Universidad de Jaén, Campus de las Lagunillas S/N. 23071, Jaén, Spain

* Corresponding Author: rmelero{at}ujaen.es

Received July 5, 2005; accepted in principle September 22, 2005; accepted for publication October 6, 2005; published online October 10, 2005
Communicating editor: K.J. Flynn

Eudiaptomus gracilis and Eudiaptomus graciloides are amongst the most common calanoid copepods in Europe and co-occur in many lakes. To understand their ecological dynamics, it is essential to know their responses to environmental variation. The finding that E. graciloides exhibits diapause in winter, whereas E. gracilis reproduces throughout the year indicates that the two species might differ in their temperature responses. We measured embryonic and naupliar development times, clutch size (number of eggs per sac), hatching percentage and body length of the first copepodid stage (CI) of both species under non-limiting food conditions at different temperatures. Special attention was given to individual variability on development times and to the use of the gamma density function (GDF) for fitting the probability of moulting. Results show that E. gracilis exhibits just slightly faster development times, lower individual variability, higher hatching percentage and larger clutches than E. graciloides and that extreme temperatures affected E. gracilis less intensely than E. graciloides. GDF was a good tool for estimating individual variability in the different experiments.


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